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When you open the Component Category Manager (Categories.exe), some of the categories are missing.
The install program for Adobe Acrobat Reader installs some corrupt entries in the Component Categories section of the registry. The Component Category Manager encounters these corrupt registry entries when it is populating its list of categories and fails to add all of them to the list.
Use the FixRegistry.exe utility to report and fix errors in the Component Category section of the registry. This utility is located in the \arcgis\arcexe81\ArcObjects Developer Kit\Utilities folder.
For more information, please refer to the help topic for this utility in the Utilities section of the ArcObjects Developer Help.